Constant-current/constant-voltage Linear Charger for Single Cell Lithiumion Batteries Suitable for Portable Applications
LowPowerSemi's LP28056S is a complete constant-current / constant-voltage linear charger for single cell lithiumion batteries. Its ESOP-8 package and low external component count make the LP28056S ideally suited for portable applications. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be ISET rammed externally with a single resistor. The LP28056S automatically terminates the charge cycle when the charge current drops to 1/10th the RISET rammed value after the final float voltage is reached. When the input supply is removed, the LP28056S automatically enters a low current state, dropping the battery drain current to less than 1µA. The LP28056S can be put into shutdown mode, reducing the supply current to 1µA.
Other features include charge current monitor, under voltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.
Features
Programmable Charge Current Up to 1200mA
No MOSFET, Sense Resistor or Blocking Diode Required
Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
4.2V Charge Voltage with ± 1% Accuracy
1µA Supply Current in Shutdown
Short-circuit protection
Consumption Available in ESOP-8 Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA/DSC
Bluetooth Applications
Order Information
Typical Application Circuit
- 【Datasheet】LP28056S 1.2A Single-chip Li-ion and Li-POL Charge Preliminary Datasheet
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